Manufacture of concrete pipe.



A. M. HIRSH da J. C. MITCHELL.

MANUFAGTURE 0F CONCRETE PIPE. APPLICATION rILED 0013.20, 1908.

Patented July 7, 1914.

3 SHEETS-SHEET 1.

A. M. HIRSH & J. C. MITCHELL. MANUFACTURE 0F CONCRETE PIPE. APPLICATION FILED ooT.2o, 1908.

,102,584 Patented July 7, 1914.

3 SHEETS*SHEET 2.

@t fuga' W A. M. HIRSH L J. C. MITCHELL.

MANUPAGTURE 0F CONCRETE PIPE. APPLICATION FILED 00T. 2o, 1908.

1,102,584., Patented July '7, 1914.

3 SHEETS-SHEET 3.

ENTTED sTATEs PATENT oEEroE.

ALLAN M. HIRS'H, 0E MONTCLAIR, NEW JERSEY, AND JOHN MITCHELL, 0F NEW'PORT NEWS, VIRGINIA.

MANUFACTURE. OF CONCRETE PIPE.

incassa..

Specication of Letters Patent.

Patented July "4', 1914.

Application led October 20, 1908. Serial No. 458,734.

Our invention'relates to the nnrnufacture of concrete pipe, more particularly for use in sewers, having Vpart or all of' its interior lined with vitrified or glazedl brick, or equivalent material, and our chief object is to provide a simple, che'a and eective method for making pipe o this character.

The nature of the invention will be readily understood when explained in connection with the annexed drawings, and referring now thereto,

Figure lis a vertical section showing a section of pipe in process of formation.A

Fig. 2 is' a plan view of the same. Figs.

y 3 ande are detail plan views. Fig. 5 is a viously stated, may be tiles,

detail sectionalvview showing a convenient way of supporting a reinforcing fabric in the pipe-mold when it is desired to make reinforced pipe. Fig. 6 is av longitudinal sectional view of a finished section of tpipe.

In carrying out our invention a suitable that shown This mold bellmold isV provided, for example in the accompanying drawings. is constructed for the formation of end pipe of the ordinary shape, and sists of an inner part and an outer part. The former comprises a base 1, say of cast iron, and an inner form er core 2,- preferably of stiif sheet metal. The outer part of the mold consists of a ring 3, formed to cooperate with the base 1 tov give the desired bell, and an outer casing 4.

The outer member -of the mold being removed, the lining pieces 5, which, as previtrified bricks,

or other suitable material, are placed flat vagainst the core or inner form 2 as shown lining pieces may" in Figs. 1 and 2. These be of any convenient size, but are preferably rectangular, the longer in proportion to width the better.. The lining may extend over the entire core,

entire inner surface of on completion of a course,

may be left con- ' between contiguous pieces,

thus covering the the pipe when finished, but for pipe to be used in sewers it is usually unnecessary to have more than about half of the surface lined, for examp le, as illustrated in Fig. 6; the lined portion being the bottom of the sewer when the pipe sections are assembled in the trench.

In order to prevent any possible displacement of the lining pieces during the subsequent illing of the mold, thefpieces may be held to the core by the simple expedient illustrated. For this purpose the core, before laying a course of liningpieces, is encircled with a band, such as a stout wire, 6, having a yielding section, for example a coil spring 7 To lay the lining pieces the wire is drawn away from the core far enough to permit insertion of the pieces one after another, the resiliency of the elastic section of the band serving to hold each piece iirmlyin position on the core while the succeeding pieces of the course are being laid. When the course is completed the elastic section of the band, is removed, the ends of the wire twisted tightly together and laid flat against the core. The next course is then assembled in the same manner, and so on until the necessary number of courses are in place. It is to be understood, however, thatl the elastic section of a band neednot be removed immediately or before the next, as all the elastic sect-ions in until the full number of courses is complete; or, if desired, the said sections need not be removed at all, but it is preferable to take them out.

The lining being in place on the core, the outer part of the mold is placed in position, as shown in Figs. 1 and 2 concrete is now deposited in the mold and tamped down. If the lining pieces are in the form ofrectangular prisms, as will ordinarily be .the case, V-.haped spaces will be left as shown at 8 in Fig. 3, and the concrete, entering these spaces,-takes a very firm grip on the blocks, anchoring them firmly in position. When the mold is full the top of` the concrete is smoothed oif withv a trowel or other suitable imp-lement.'

After the concrete has set the mold sec'- tions are removed. The binding wires are laying of the thereby exposed von the unlined inner surface of the pipe, and can be stripped thereand ' as fast as needed,

' this purpose the base l of n claims.

-Afin The pipe can be manufactured in a factory,

and shipped to the point of use, more cheaply than the pipe can be constructed bythe method heretofore in vogue.

Prior to our invention it has been customary to first construct the concrete portion, in the trench, then to lay the lining bricks after the concrete had set. Such method is not only costly and troublesome, but also requires considerable time for the completion of the sewer, since the concrete part of the structure cannot be built until the trench is dug, and the lining cannot be laid until the concrete part has set. The 'result is that brick or tile-lined concrete sewers are not resorted to except when the excessive cost can be disregarded or where conditions demand that the pipe shallv have the maximum resistance to erosion. On the other hand, pipe of standard sizes and shapes can be constructed by our method far in advance of use and kept in stock, ready for laying or the pipe can be umade while the trench is beingdug, with the' result that the building ofthe sewer need take very little more time than the digging ofthe trench. f

The pipe constructed by our method can of course be reinforced if desired. For

the inner moldmember can be provided with a groove or slot 9, Fig. 5, in which the reinforcing fabric l0, of any suitable kind, may be set after the lining pieces are in place; said groove being in position to maintain the fabric preferably about midway between the lining and the outer mold-member.

The procedure herein specifically described constitutes the preferred manner of practising our invention, but may be varied without departure from the proper scope ofthe invention as set forth in the appended What we claim is:

l. The hereindescribed method of4 constructing a concrete pipe, which consists in placing elastic wires around an inner cylindrical form or core, arranging the lining pieces against an arcor section of. said core `and binding the same thereon with said elastic wires, inclosing the inner form in anvouterform of the same contour and spaced therefrom, 'supporting a continuous reinforcing .fabric between the inner and outer' cylindrical mold sections,- and upon the base of the mold, and filling the spaces between the inner and outer mold sections with concrete.

2. The herein described method of constructing a concrete pipe .which consists in setting an .inner substantially cylindrical form or core in substantially a vertical position, placing elastic wires around said cylindrical form or core, arranging the lining piecesl against an arc or section of said vertically placed core and4 under said elastic wires whereby the pieces are held firmly in position on the core, inclosing the inner cylindrical form in an outer vertically arranged form ofsubstantially the same contour and spaced ltherefrom, and lling the spaces between the inner and outer mold sections with concrete.

3. The hereindescribed method of con-- structing a concrete pipe which consists in setting an inner substantially cylindrical form or core in substantially'vertical position upon the base of the mold, placing elastic members around said cylindrical form or core, arranging the lining pieces against an arc or section of said vertically placed core and under said elastic members whereby the pieces are held firmly in position on the core, inclosing the inner cylindrical form in an outer form of substantially the same contour and spaced therefrom, supporting a continuous reinforcing fabric between the inner and outer mold sections and upon the base ofthe mold, and

filling the spaces between the inner and outer mold sections with concrete.

4. The herein described method of constructing a concrete pipe which consists in setting p form or core in substantially vertical position, placing wires having yielding sections connecting the ends thereof around said cylindrical form or core, 4arranging the lining pieces against an arc or section of said vertically placed core and under said wires whereby the pieces are held in position on said core', removing the yielding sections and connecting the ends of the wires together, inclosing the inner cylindrical form 1n an outer form of substantially the same contour and spaced therefrom, supporting a continuous reinforcing fabric between the inner and outer mold sections and upon the base of the mold, and filling 4the spaces between the inner and outer mold sections with concrete.

ALLAN M. HIRSH. lJOHN C. MITCHELL. Witnesses:-

S; S. DUNHAM, COLEMAN MERIWETHER.

an lnner substantially cylindricalV 

